Telephone-transmitter



o. W. LONG.

TELEPHONE TRANSMITTER.

(NeModel.)

Patented Sept. 30,1884.

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fEErcE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 306,026, dated September 30, 1884.

Application filed June 16, 1884. (No model.)

To all whom t may concern:

Beit known that I, CHARLEs W. LONG, of Louisville, Kentucky, have invented acertain new and useful Improvement in Telephone- Transmitters, of which the following is a speciiication.

My invention has relation to telephonetransmitters, and is directed to obtaining a simple and efficient form of such instrument which can be easily and accurately adjusted. To this end I combine with the diaphragm the button, which makes contact therewith, and.

a conductor electrically connected with' the button, and consisting,for a portion ofits length within `the transmitter, of a spiral coil, an independent insulated spring which bears upon the contact-button, and means whereby the pressure exercised by said'spring upon the button can be varied at will.

I am aware that it is not new, broadly, to give the conducting-wire thatcarries the con,- tact-button the form of a spiral coil, this being for the purpose of providing` a way by which the pressure of the button on the dia phragm can be varied. In my case, however, the coiled spring by which the pressure is obtained is an independent spring not in the circuit. It is this spring which determines the pressure for the great part, if not entirely. The coiled portion of the circuit-wire, while itv may exercise to a certain extent pressure ancillary to that exerted' by the main spring, is, however, made light and thin, its principal function being to allow the button' to respond freely to the vibrations of the diaphragm.

The nature of my improvement and the manner in which the same can be carried into practical effect will be understood by reference tothe accompanying drawings, in which- Figure l is a vertical central section, and Fig. 2 is a plan, of a telephone-transmitter embodying my invent-ion. Fig. 3 is a vertical central section of a modification hereinafter described.

In the transmitter shown in Figs. l and 2 the diaphragm A is horizontal. This diaphragm is of the usual kind, being made of some conducting material, and electrically connected with the circuit-wire B is the case of the transmitter, and C the voice-opening. The diaphragm rests on an annular shoulder, a., in the case, and is held down by a clamping-ring, D, provided with a central bow, D. rlhe ring is held down with clamping pressure on the diaphragm by a bridge-piece, E, which spans the case B at right angles to the bow D', and rests on the central part of` the latter. One end, b, of the bridge-piece enters a hole in an ear, c, on one side of thev transmitter. On the opposite side of the transmitter is another" ear, d, through which passes a clamping-screw, e, whose inner end bears upon the inclined upper face of the other end, f, of the bridge-piece. By advancing the clamping-screw it will act to force,

down the bridge-piece upon the bow D', and thus to clamp the ring-D upon the diaphragm. This, which is one convenient way of clamping the diaphragm, is not of my invention. Other means for the purpose can, if desired, be employed. The contact-button g--usually of carbon#is surrounded by a ring, 7L', of non-conducting material, attached to the diaphragm, and is held against the button by a spring, h, whose pressure is regulated by a screwethimble, F, which passes through an opening, i, in the bridgepiece E, and screws into and through a hole in the bow D', which thus forms a bearing for the thimble. The thimble at its inner andlower end is enlarged, so as to encircle and inclose the-spring h. The latter is coniined between a shoulder on the thimble above and the button g below, a disk, y', of non-conduet ing material, being interposed between the spring and the button. To the button is electricall y connected the cond u eting-wire y, which for a portion of its length is coiled, as shown at 7c, this coiled portion being usually made of thin platina wire. The wire passes out from the transmitter through a tubular nonconducting plug, Z, inserted in the thimblc F.

I prefer to place above the spring 7L a thin nonconducting disk, m, through which the conductor y passes. on top of the outer spring, 71., but also on the `coil 7c, so that by advancing the thimble both coils will be compressed. The circuit is made through zr, the diaphragm A, button g, and thence to line through wire It y.

In the modication shown in Fig. 3 the arrangement is similar in a general way to that shown in Figs. 1 and 2, and the lettered partsin This disk rests not only IOO this figure correspond to like lettered parts in the preceding figures. The diaphragm, however, is vertical instead of horizontal, and the carbon contact-button is thicker than in Fig. 1. 5 To sustain the button in proper position with respect to the Vertical diaphragm, I make use of a bent arm, G, attached to the ring D, and extending down and under the button, forming a cradle in which the latter can rest. Be- Io tween the cradle part of the arm and the button is interposed noneondueting material n. In this figure the conducting-wire y is represented as both electrically connected and mel chanically united to the carbon button. I aci 5 complish l[his result easily and effectively by means of a conducting amalgamfor example, an amalgam of mercury and a good conducting metal-orany good conducting metal alone. The inner end of the conducting-wire is in- 2o serted in a hole or socket, o, in the carbon button, and then this hole is partly illedwitli the amalgam, as represented at p, which istamped around the wire, so as to hold it tight to the button. The amalgam hardens land perma- 25 nently unites Jthe two mechanically, and electrically as well.

Having described my improvement and the best way known to me of carrying the same into effect, what I claim herein as new and of my own invent-ion is as follows:

1. The c0mbination,with thediaphra gm and the contact-button, of the spirally-coiled conducting-wire electrically and mechanically connected to the button, the independent insulated spring which holds the button against the diaphragm, and the thimble for holdingthe spring and button, substantially as hereinbefore set forth.

2. The combination of the diaphragm, the contact-button, the spirally-coiled conductingwire electrically and mechanically connected to th e button, the independent insulated spring for holding the button against the diaphragm, thc thimble for holding the spring and but ton, and means, substantially as described, for varying the pressure of the spring.

In testimony whereoi I have hereunto set my hand this 13th day of June, 1884.

CHAS. NV. LONG.

Vitnesses:

EWELL A. DICK, J. XVALTER BLANDFORD. 

